The adventures of the strongest girl in the world, who takes her two friends with her when she travels from Sweden to visit her father, king of an island in the South Seas.
Ronia, who lives with her father and his band of robbers in a castle in the woods, causes trouble when she befriends the son of a rival robber chieftain.
Johan and his family are poor and they lose their only cow. The next day when Johan is shoveling snow, he discovers a calf in a roadside ditch and gets a surprise when he learns the true owner of the calf.